Quote Originally Posted by keith66 View Post
Quick lesson on glues from an experienced boatbuilder who has used them all & seen failures in most of them! in order of strength & durability, PVA is ok for interior work but its not waterproof & not for things like gunstocks, There is a similar waterproof glue called Titebond 3 that is a lot stronger & just as easy to use.
Gorrila glue, or similar foaming PU glues are for quick & dirty work & do not have long term strength or durability.
Cascamite is a urea formaldehyde one of a family of glues developed for aircraft in WW2 (including the mosquito) Aerolite is a another that is very good. They are not recomended for underwater use & will start to degrade after 30 years or so.
Rescorcinol glues like Aerodux or Cascophen are still available & were also developed for aircraft use. They are still the most durable & waterproof glues going, they are not the easiest to use as they need very accurate mixing & are sensitive to temperature.
Epoxies are the strongest & most versatile, waterproof & easy to use. Main drawback is they have very low UV resistance so if exposed should be painted or varnished.
I bow to your specialist knowledge of glue suitability & stand corrected on cascamite for long term submersive use, but the point I was trying to put across is as you say pva is not suitable long term for gunstocking repairs, I agree with you on epoxy resin, but as the op has used cascamite I would like to reassure him that its more than up to the job,
Regards G